Add per-disk profiles with video transcoding support

Each disk stores .jukebox/profile.json with copy parameters (dest
folder, overwrite mode, file select, reserve space, auto-copy) and
optional transcoding limits for the target player (codec, resolution,
bitrate, FPS, audio channels, output format).

On copy, video files are probed with ffprobe; if they exceed the
profile limits they are transcoded via ffmpeg (-threads 0 for full
CPU usage), otherwise copied as-is. Scale filter never upscales.

New: internal/disk/profile.go, internal/transcoder/{detect,transcoder}.go
API: GET/PUT /api/disks/profile?mount_path=
UI: disk profile panel in dashboard for known disks
Dockerfile: adds ffmpeg to the runtime image

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

cmd/jukebox/main.go

@@ -126,7 +126,7 @@ func main() {
 		switch ev.Info.State {
 		case disk.DiskKnown:
 			openDiskDB(ev.Info)
-			if watcherReady && ev.Prev.State != disk.DiskKnown && cfg.AutoCopy {
+			if watcherReady && ev.Prev.State != disk.DiskKnown {
 				triggerAutoCopy(cp, cfg, ev.Info)
 			}
 		case disk.DiskForeign:
@@ -197,6 +197,15 @@ func main() {
 }
 
 func triggerAutoCopy(cp *copier.Copier, cfg *config.Config, info disk.DiskInfo) {
+	// Используем AutoCopy из профиля диска, если он есть; иначе — из глобального config
+	autoCopy := cfg.AutoCopy
+	if info.Profile != nil {
+		autoCopy = info.Profile.AutoCopy
+	}
+	if !autoCopy {
+		return
+	}
+
 	hasEnabledSources := false
 	for _, s := range cfg.Sources {
 		if s.Enabled {
@@ -207,18 +216,31 @@ func triggerAutoCopy(cp *copier.Copier, cfg *config.Config, info disk.DiskInfo)
 	if !hasEnabledSources {
 		return
 	}
+
+	opts := copier.Options{
+		DiskID:            info.DiskID,
+		MountPath:         info.MountPath,
+		MediaPath:         cfg.MediaPath,
+		SourceRules:       cfg.Sources,
+		AllowedExtensions: cfg.EffectiveAllowedExtensions(),
+		OverwriteMode:     cfg.OverwriteMode,
+	}
+	if p := info.Profile; p != nil {
+		opts.DestFolder = p.DestFolder
+		opts.ReserveFreeGB = p.ReserveFreeGB
+		opts.FileSelectMode = config.FileSelectMode(p.FileSelectMode)
+		opts.Transcode = p.Transcode
+		if p.OverwriteMode != "" {
+			opts.OverwriteMode = config.OverwriteMode(p.OverwriteMode)
+		}
+	} else {
+		opts.DestFolder = cfg.DestFolder
+		opts.ReserveFreeGB = cfg.ReserveFreeGB
+		opts.FileSelectMode = cfg.FileSelectMode
+	}
+
 	go func() {
-		_, err := cp.Start(context.Background(), copier.Options{
-			DiskID:            info.DiskID,
-			MountPath:         info.MountPath,
-			MediaPath:         cfg.MediaPath,
-			DestFolder:        cfg.DestFolder,
-			SourceRules:       cfg.Sources,
-			AllowedExtensions: cfg.EffectiveAllowedExtensions(),
-			ReserveFreeGB:     cfg.ReserveFreeGB,
-			OverwriteMode:     cfg.OverwriteMode,
-			FileSelectMode:    cfg.FileSelectMode,
-		})
+		_, err := cp.Start(context.Background(), opts)
 		if err != nil {
 			log.Printf("auto-copy: %v", err)
 		}